Apparatus and method are disclosed for providing a non-presubscription subaccount billing service utilized by customers on a "per call" or "as needed" basis. A calling customer initiates the service by dialing "0" plus the directory number of the called line. The local office serving the calling line...http://www.google.com.au/patents/US4776004?utm_source=gb-gplus-sharePatent US4776004 - Communication services method and apparatus
